I think the other bit is another mic that's designed to pick up the background noise so the processor in the mic can cancel it out? That would explain much. Until you find it again, can you just turn the noise cancellation off?

Update: OK, I found the small piece. But what does it do exactly? There is a piece of double sided tape on the back, it looks like it will stick to your desk or a wall... No sign of removable batteries..

Go to recording devices! And check for mic volume ! Happens to me EVERYTIME I turn on my computer. I have to manually raise the volume for the mic. I have the same exact mic.

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Bah! That's so lame
Thanks, I found the mic volume level and bumped it up from 25 to 65.. seems to do the trick.
I still have to kind of put my mouth next to the mic and try not to talk overly loudly so I don't break eardrums on the receiving end, but it seems to work now..
+rep!